Here's an accident you may want to do on purpose! I had started marinating the caps, being sure to spoon plenty of marinade into the caps themselves, when I realized I had forgotten the garlic. I minced up the two cloves and decided to put all the garlic directly into the marinade inside the caps with none in the outside marinade. I baked them for only 20 minutes with no flipping. With tongs I pulled the mushroom out draining the marinade but leaving all of the garlic bits inside the caps. Garlicky yummyness!